tec: Remove Rails pid file at starting
tec: Remove Rails pid file at starting

The file wasn't be deleted when stopping the Docker container and so we
weren't able to rerun Rails other than deleting the file before.

Reference: https://github.com/docker/compose/issues/1393

marienfressinaud/project-zero,marienfressinaud/project-zero,marienfressinaud/project-zero,marienfressinaud/lessy,marienfressinaud/lessy,marienfressinaud/lessy